高应变测试法中弹限取值的研究及工程应用

赵春风^1,2, 李尚飞^1,2, 张志勇³, 金政⁴, 鲁嘉^1,2

1.同济大学岩土及地下工程教育部重点实验室;2.同济大学地下建筑与工程系;3.上海城建集团公司;4.上海景瑞地产股份有限公司



摘要:

为了掌握高应变动力测试单桩极限承载力中波形拟合法的应用,对波形拟合法中桩土模型参数弹限的取值进行研究.通过某地区现场动、静力试验,获得了桩侧土摩阻力和桩土相对位移数据,并对数据进行回归分析.结果表明,用双曲线拟合桩土间摩阻力与桩土间的相对位移关系是合适的,在此基础上,提出分层取弹限的方法,用此方法获得的弹限值应用在实际工程测试计算中,有效提高了高应变测试单桩极限承载力的精度.

关键词:  高应变动力测试法  单桩极限承载力  弹限  波形拟合法

DOI：10.11918/j.issn.0367-6234.2011.02.024

分类号:TU473.16

基金项目:上海市重点学科建设资助项目(B308)



Study and engineering application of quake in high-stain dynamic test

ZHAO Chun-feng^1,2, LI Shang-fei^1,2, ZHANG Zhi-yong³, JIN Zheng⁴, LU Jia^1,2

1.Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,200092 Shanghai, China;2.Department of Geotechnical Engineering,Tongji University,200092 Shanghai,China;3.Shanghai Urban Construction Group Co.,200122 Shanghai,China;4.Shanghai Jingruis Corporration Limited,200041 Shanghai,China)

Abstract:

In order to study application of waveform fitting method of high strain dynamic testing methods in testing vertical bearing capacity of single-egress analysising of the data of pile shaft resistance and corresponding pile-soil relative displacement.The analysis indicates that hyperbola can fit the relation of pile shaft resistance and the corresponding pile-soil relative displacement well.So a new method to gaining quake limit for stratified soil is designed.Applying the method to actual engineering,and achieved more reasonable results.

Key words:  high strain dynamic testing method  ultimate bearing capacity of a single pile  quake  waveform fitting method